Electric motor.



E. S. PILLSBURY.

ELECTRIC MOTOR.

nrmourxon FILED MAY 14, 1910.

Patented Oct. 25, 1910.-

a sums-511mm 1.

E. 8. PILLSBUBY.

ELECTRIC MOTOR. APPLIOATIOI rum) in 14, 1010.

Patented Oct. 25, 1910. 7

" Inuanz'ar" RZLsZu-r the armature.

mwifnw s. rmnsntmr, or sr. tours,

mssoum. Assm'no'n '10 CENTURY anaemic COMPANY, A CORPORATION OI MISSOURI.

- ELECTRIC HO'I'OE.

masts.

Specification 0! Letter: Pat ent.

Patented Oct. 25, 1910.

' Application filed my 14, I910. lei-ta! No. 661,382.

, To all whom it may concern:

Be it known that I, Euw n' S. Pnasnuny, a citizen of the United "States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in )lectric Motors,,of which the following is a specification.

'lhe principal object of my invention is'to provide a new and im rovcd dynamo electric imichinehaving a aminated field magnet structure so disposed as to give a starting torque when energized with single phase alternating current, rent flows through a single energizing circuit.

Another object of my invention is to provide a single phase alternating current electric motor with a laminated field magnet structure, the thickness of the laminae being different at different parts and so disposed that a starting torque shall be exerted upon These and various other objects will-be made a parent in-the following specification and claims, when taken in connection with the accompanying drawings.

In these drawings,l have by way of example illustrated one specific embodiment of my invention, but the invention will be understood to be delined in theappended claims.

Referring to the drawings'l igurc 1 is a vertical section of an alternating current ceiling fan 'motor so constructed as to embody my invention. Fig. 2 is a horizontal section thereof, taken on the line 2 in Fig. 1 looking down. l igs. 3, 4 and 5 are en; larged detailsshowing the field magnet laminations and with the windings diagrammatical l y indicated thereon.

The motor is suspended from the oeilin by the'tubular member 15, to the bottom end of which the field magnet spider 22 is secured b means ofthe' boss 16 engaging the 46 screw tireadslfl. T he set screw 18. serves top shield or cover 19.

as an additional means to secure the parts ,in fixed relation. The boss 16 supports. the "Depending from the dly united therewith and to the spider 22 is the column 23 which has an extension tubular member 25 on its lower end. This extension member 25 has screw threaded engagement with ,the oil well 26,

bow 16, and rig thus support' the latter. The depending column 23 ha s a screwthreaded 'nut 27 on' that is, when the car he described later.

'thi

its lower end which su ball bearing member, tie ballsof which are indicated by the reference number 28. On these balls .28'rests the coacting movable ball bearing member 29 which supports the rotatable sleeve 30, fitting around the column 23. This rotatable sleeve 30 is anintegral sart of the spider 31 which carries the c lin- 'r1cal armature frame on its perip iery. 'llhe sleeve 32 depends in fixed position froni the spider 22, surrounding the upper end of the rotatable sleeve 30 and being spaced therefrom. Thus any of the oil 51, surrounding the ball bearings in the cup 26, Which may work up between the stationary column 23 and the surrounding sleeve 30, will be directed downwardly by. the fixed outer sleeve 32 and will pass back through the openings in the rotatable spider 31. I

'lhc fixed spider 22 has a seat 33 designated generally by the reference numeral 34, to receive the field magnet laminae. 'lhese are secured in place by means of the clamplng ring 37 and solder 38. The field magnet lamina: 34 have part of the pole teeth 35 punched'integral therewith, the remainderof the pole teeth 36 being of greater thickness and se mmble from the others, as will The sockets to receive the fan blades are represented by the reference numeral 35).

The cylindrical armature-frame 4.0 holds the armature laminic 41 secured in place by solder 42. The slots in the armature are occupied by the copper bars 43 of the usual squirrel cage armature, the end rings of which are indicatel by the reference numeral 44.

Referring nowmore particularly to Figs. 3, 4 and 5, it will be seen that two adjacent teeth 35 are composed oflamilue that are rotatable integral with the main field magnet'stamplugs 34, and of course of the same thickness t .with; but it will be seen that every tooth 36 is made of thicker stockand that in punching the'laminae 34 spaces are leftso that when these teeth 36 are built up in place they will correspond in di-. mensions wi the other teeth 35. The s mee left in the stain i ngs 34- to receive thet lick teeth 86 is sligh 1y undercut at each side, as indicated by the have corms ending toes 40 adapted to slip into these undercut places.

reference nluneral 45, and' v the thick laminae 86 Infother words, the thick teeth 36 are dovetailed into place. After the windings have been applied, wooden plugs 48 are driven between the tips of a jacent field magnet teeth to brace them properly. After the laminae havefbeen completely bled, a

five tunes aroun 'every third tooth, these teeth being of thin metal. This winding goes around the'teeth-referred to in series andgoes around in opposite dinectionspn consecutive teeth Next, a wave wind-mg 50 is ap ed in series wlth the aforanentiened winding 49.. This wave windi embraces three teeth in each hight thereo and is applied around the entire field structure about seventy-five times. It is so disposed that ofthe three teeth in a blght the previousl wound teeth will be the center ones and thicker teeth 36 will always be at one side. Of course, this winding is In such dimdion that the tO mfi-V9 force thereof. acts with in against that ofthe windizf 49.

The fiel and armature slots make slight angles. with a direction parallel to the axis of the -motor.- Ibis is shown 111 Fig. 4, which is a face new of the field poles, the position of the armature shown in dotted lines.

It will be observed that the three teeth included in one bight of the wave winding 50 are subjlzctted to'the same magneto motive approach toa sine formfor force by t winding'and that the middle tooth is subject to an extra magneto motive force due to the windin 49,-:-thus an distribution of magnetism in the field is produced It will further be observed that the tooth on one side of the-center tooth which carries the windi 49 is-of thin stock, while the tooth on't e other side;is of thick stock;

' thus each pole made up of three teeth is not symmetrical in structure, but the tooth at one side is of thicker laminae than at the otherside.

I have demonstratedby actual trial that when the winding 49, 50 is supplied with a single phase alternating current a starting torque will be; exerted on the short circuited arms1ure4=B',-44.' 1

I claim:

1. -In a device of the class described, a laminated field pole, thethickness of the 1ndividual lamina! being difi'enent on two sides thereof .2. In a device .of the class described, a

teeth to each pole, part pole teeth being" tcrofares net.

eves/e I 1.11 at xiii? et h avm I luriif i Ina magn a. o

of' e eeth of integral projections from the magnet laminae, and other teeth being com fiel se to therefrom and of laminae havin a winding 49. is applied, going about twenty 8 being filled with teeth-built up from lamina of; gilfierent thi from the others.

-5.- In a device of the class described, a,

a device of the. clam described, a

laminated field magnet'havmfilpart of the teeth integral therewith and nag ces left for other teeth, these spaces be nndercut and the said other teeth being" pted to the undercut 7. In a device of the laminated field magnethaving a pluralit of teeth, eve third tooth being built up' om laminae o dlfierent thickness, and the remamm Jteeth being integral projections from e field magnet.

8, 1n a device of laminated field magnet having a teeth, eve

o difierent thi and the .rema teeth being integral projections of the fiel magnet, correspgnding ones of each PM; of ntegral teeth ing wound with a sense winding, and a wave winding superposed on the teeth by threes, each already mentioned series wound tooth the'cenve group of three.

9. In a vice of the class-dwribd, a laminated field magnet having a plurality of teeth to each pole, art of said teeth being integral with the inated field magnet and other teeth compoM of separate lamlnse, and dovetal ed joints between said other teeth and the field'magn'et, said other teeth bem built up of laminae ofa difierent thickness om the laminae of the field magplurality of 1g. In a device .of the cla'ssdescribed, a l'ammatcd field pole comprising. a large numbar of. thin larmnae .on one s1de a less the class described, It

third tooth being built up' from wees-1M, a-

number of thick laminae on the other side,

the a each 81 e ing substantiall the seine. v

11 In a device of the c described, a

slotted field pole, and field ZE- uet'windmgs in the slots thereof, the thi ate thickness of the laminae on.

ness of the individual lamina difl'er- 

